including fixed-beam IMRT and stereotactic treatments. Doctors can use
RapidArc for better prostate and head and neck treatments, and still offer
fixed beam IMRT treatments with motion management for lung and breast
tumors and electron treatments for patients with lymphomas and skin
cancers. No other treatment technology offers this kind of versatility for
customizing treatments according to each patient's specific needs."

Plan studies comparing fixed-beam and helical IMRT with RapidArc show
that RapidArc can reduce the amount of non-therapeutic radiation reaching
healthy tissues during treatment. For example, in the case of head and neck
cancer treatments, RapidArc plans are better at protecting critical
structures like the spinal cord, brain stem, eyes, optic nerve and chiasm,
parotid (salivary) glands, and brain. Moreover, with RapidArc's highly
efficient use of the primary beam, secondary stray radiation caused by
scatter and leakage are reduced by over 50 percent on average compared with
fixed field IMRT.

RapidArc Technology

RapidArc technology utilizes a sophisticated, proprietary algorithm
that creates a finely-shaped IMRT dose distribution that closely matches
the size and shape of the tumor. It works by varying three parameters
simultaneously: 1) the speed with which the treatment machine rotates
around the patient, 2) the dimensions of the beam-shaping aperture, which
change continually during the treatment based on the patient's unique
anatomy, and 3) the rate at which the dose is delivered. These technologies
work together to make RA the most revolutionary advance in radiation
therapy in terms of speed, efficiency, and conformality.

"The RapidArc planning algorithm exploits the unique characteristics of
Varian's most advanced medical linear accelerators, which can deliver dose
at different rates, and the multileaf collimator, which is used to shape
the beam so it conforms to the shape of the tumor," said Corey Zankowski,
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